Toothbrush



FIG. 1 is a top plan view of a toothbrush showing my new design;

FIG. 2 is a side elevational view thereof; and,

FIG. 3 is a bottom plan view thereof.

The undisclosed side is the same in appearance as the side shown and the undisclosed ends are unornamented. 

The ornamental design for a toothbrush, as shown and described. 